Three Headed Wolf

In the Lower World, one would ascend and be forced to cross the 9 Heavenly Steps of Nirvana to reach the Celestial Realm.

As glorious as it sounds, it's cruel. The entire body would be torn apart. Each cell would be killed and brought back to life to make a complete new body for the soul to accommodate in the Celestial Realm.

For a lower being to ascend to the Celestial Realm, they would first have to form a mana core if they are a species that wield mana.

In the Lower World, mana is a tool that brings one closer to the truth. However, the mana of residents do not have a form or shape, it is better to say that mana is quite bland.

When the mana core would be formed, the true journey towards truth would begin. Since bodies of lower beings are not made to hold mana cores they have no other choice but to ascend.

In the Celestial Realm, Mana has boundless known Tiers and Three stages of mastery- Early, Peak and Perfection. However, the highest known tier is 9.